13249509847 has 4 divisors (see below), whose sum is σ = 15142296976. Its totient is φ = 11356722720.

The previous prime is 13249509811. The next prime is 13249509863. The reversal of 13249509847 is 74890594231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74890594231 = 193 ⋅388034167.

It is not a de Polignac number, because 13249509847 - 2¹⁵ = 13249477079 is a prime.

It is a super-2 number, since 2×13249509847² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13249509794 and 13249509803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13249509347) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 946393554 + ... + 946393567.

It is an arithmetic number, because the mean of its divisors is an integer number (3785574244).

Almost surely, 2^13249509847 is an apocalyptic number.

13249509847 is a deficient number, since it is larger than the sum of its proper divisors (1892787129).

13249509847 is an equidigital number, since it uses as much as digits as its factorization.

13249509847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1892787128.

The product of its (nonzero) digits is 2177280, while the sum is 52.

The spelling of 13249509847 in words is "thirteen billion, two hundred forty-nine million, five hundred nine thousand, eight hundred forty-seven".